The early Senate's primary role was to offer counsel to the king on matters of state. While its authority was limited under the monarchy, the Senate's influence grew as it represented the city’s elite and carried the weight of collective wisdom. Senators held their positions for life, symbolizing stability and continuity within the Roman state. The Senate's name itself, derived from the Latin word "senex" (meaning old man), emphasized the value placed on experience and elder leadership. During this period, the Senate did not possess legislative or executive power but acted as a stabilizing force, guiding the monarch through complex political and military decisions.
The transition from monarchy to republic in the late 6th century BCE marked a significant turning point for the Senate’s role. After the fall of the last Roman king, Tarquin the Proud, the Senate became more central to governance. The expulsion of the monarchy led to the establishment of the Roman Republic, where power was distributed more broadly among elected magistrates. The Senate, now composed mainly of patricians, gained considerable influence as a body that advised the newly formed consuls. Although it remained technically advisory, its recommendations, known as "senatus consulta," became increasingly authoritative, shaping legislative and executive decisions.